Rope structure



Aug. 10 1926. v 1,595A3 H. M. WALL ROPE STRUCTURE Filed July 2 1923 4732 1 L ZZK- A TTORNE Y raisins nag. in, race.

nnrrn STATES PATENT OFFICE.

nelson) n1.

WALL, 0?? BEVERLY, NEW JERSEY, ASSKGN'OR T0 WALL ROPE WORKS, INC.,

OF NEW YQItK, N. 2., A CORPORATION OF NEW JERSEY.

norn srnnorunn.

Application filed July 2,

This invention relates generally to rope or cordage construction, and more particularly to the structure of the individual strands which are twisted together to form the completed product.

The invention includes a strand formation of the general type in which bodies or masses of fibres form strand core members which are wound or wrapped with covering yar In strands of this general constructio which have been heretofore manufactured, the strand cores, have consisted of a single body or untwisted fibres or of general groups; e. g, two or more groups twisted in the same direction and these groups then twisted and laid together; or of a multiplicit'y of twisted interior yarns. The first mentioned structure is lacking in firmness and compactness, while the secondand third are characterized by excessive detrimental internal irition.

In the present invention 1 have succeeded in eliminating the various objectionable features referred to by making use of a strand core consisting of two or more bodies of fibre between which there is relatively negligible frictional contact. Tim reduction in friction is achieved in great part by the par-5 ticular relation between the core parts which differ from the prior construction in that they are not twisted in the same direction. I have found that advantageous results can be achieved by twisting the core parts in opposite directions. In the construction referred to. it will be seen that a balanced construction is obtained in which there is no tendency for the rope to kick or twist on q itself. The reduced number of parts reduces the shearing action that is present where a multiplicit oi yarns is used, and the tensile strength 0 the strand and rope is increased.

The construction provides also for a less number of twists or turns per unit length, and thereby increases the pliability of the construction. In addition, the characteristic twist and relation of the core parts rovide a method of identification of the pro uct.

In the drawings, in which a preferred form of the invention has been selected for illustration,

Fi re 1 is a view of a section of rope en1- bodylng the invention and opened out at one end to show the internal construction; and

1923. sem no. 648,931.

I Figure 2 is a sectional view of the rope shown in Figure 1 taken on the line 22.

Referring to the drawings for a more detailed description of the invention, a section of rope embodying the invention is shown at 10, and is made up of'three strands 11 twisted together to form the final product. While a three strand rope is shown for the purpose of illustration, it will be clear that a lesser or greater number of strands may The core parts 12 consist of relatively large bundles or groups of fibres having, in the instance illustrated, a twist in opposite directions, that is, the fibres of one of the core parts are twisted in a right-hand o1" clockwise direction and those of the other core part in a left-hand or counter-clockwise direction, from the standpoint of an observer looking along! the len h of the strands.

' I have iouhd that y combining two or more bodies of fibres, the fibres of one body being twisted in an oppositedirection from the direction of twist in another body, a

construction is provided in which the several" parts balance each other and do away with the tendency to unwind or untwist. The result of this is that the strand and conseuently the rope including the structure of strand referred to, is" free from the tendency to kink or to spin when a len h of rope so constructed is used to suspen a body. By

reason of the twist which is characteristic of the individual core parts 12, the ultimate rope or cable, possesses a high degree of pliability, and at the same time the core parts provide a {compact body having minimum frictional contact between the members and possessing a relativel high degree of tensilestr ength. In addition the peculiar relation that exists between the core parts obviates the tendency to shear that might.

otherwise exist.

The strand 11 is completed bywrapping the core parts 12 with the covering yarns i3,

ah'sady zei errori 50; and a rope or ooiiio may be formal by twisting together two or more of such si'isnds in a known manner -l claim:

rziiit'y of strands twisted togosheic each strand including o plui'siiiy of distinct groups of fibers, each group of fibers being twisted in ii different direction from bho fibers in the adjacent group, and or yarn covering Wound into place on each of said strands.

2. A rope construction made up of a piulfliiiy 01" strands twisisci together, sash sti'and including a plurality of distinct gicoups of fibers, each group of fibers being twisted in a difieronz direction from the fibers in the adjacent group, said groups of fibers being twisted together, and s yarn covsi'ing on cash strand.

3. A m x; consiruotion made up of a piuraiiiy of si'irands twisted together, each strand having a. core composed of a piuraL it; of distinct groups of fibers, all of the fibers in one group being twisted in the op posits; (lire-Chou file twist of the fibers in the adjacent group, said groups of fibers 20-- twisted togeiher to form the Loire and in covering on each sii'and. A mp1: construction made up of a pini. A rope construction made up of 2:, :{Jillcover; 9; Y-

' i odies o" sisi-ing o 1' distinct bundles m: bundie being the fabms in twisted. in iii oral sun the sore 

